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...Jfe technical report no jan manufacturing processes and products of steel pipes tubes in masamura katsumi nagahama yutaka abstract distinctive features operates facilities for seam at less various types welded order to pipe tube system respond a wide range customer requirements dis tinctive include large diameter heavy wall electric resistance its east japan works west erw linepipes uoe high strength chita performance an outline the pro formability used automotive parts cess is shown fig depending on this paper presents process can be divided into three classes together by welding method i e arc resis with representative tance butt manufactured further introduction bending press spiral differences forming among as result merger former kawasaki hot rolled sheet mate nkk april rial newly created while plates are was expanded four districts chiba district keihin fuku s yama comprise one line each specialized mills product encom passing seamless including lines two supplies table shows all...